Staging: rtl8188eu: Refactor conditional code to increase readability

Remove the nested conditionals. The if and else-if have the same
code so they are combined to make the code more compact.

Signed-off-by: Vatika Harlalka <vatikaharlalka@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>